If two parallel planes are cut by a third plane, then the lines of intersection are _________.
2 answers:
Parallel planes are two planes that do not intersect.
Theorem: If two parallel planes are cut by a third plane, then the lines of intersection are parallel.
In the attached picture you can see two parallel planes P and M that are cut by plane R. The lines of intersection are:
- CD - planes P and R;
- AB - planes M and R.
Conclusion: AB||CD.
Answer: parallel.
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Width of the reactangle = 38 cm
Minimum perimeter = 692 cm
Let the length of the rectangle be x cm
We know that,
Perimeter of rectangle = 2 * (length + width)
Since the perimeter should be atleast 692 cm. Therefore,
2 * (x + 38) > 692
2x + 76 > 692
2x > 692 - 76
2x > 616
x >
x > 308
Hence, the length of the rectangle should be more that 308 cms.